This repository was archived by the owner on Jun 24, 2022. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 2k
Expand file tree
/
Copy pathDebuggerScope.cpp
More file actions
264 lines (228 loc) · 9.83 KB
/
DebuggerScope.cpp
File metadata and controls
264 lines (228 loc) · 9.83 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
/*
* Copyright (C) 2008-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DebuggerScope.h"
#include "JSLexicalEnvironment.h"
#include "JSCInlines.h"
namespace JSC {
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(DebuggerScope);
const ClassInfo DebuggerScope::s_info = { "DebuggerScope", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(DebuggerScope) };
DebuggerScope* DebuggerScope::create(VM& vm, JSScope* scope)
{
Structure* structure = scope->globalObject(vm)->debuggerScopeStructure();
DebuggerScope* debuggerScope = new (NotNull, allocateCell<DebuggerScope>(vm.heap)) DebuggerScope(vm, structure, scope);
debuggerScope->finishCreation(vm);
return debuggerScope;
}
DebuggerScope::DebuggerScope(VM& vm, Structure* structure, JSScope* scope)
: JSNonFinalObject(vm, structure)
{
ASSERT(scope);
m_scope.set(vm, this, scope);
}
void DebuggerScope::finishCreation(VM& vm)
{
Base::finishCreation(vm);
}
void DebuggerScope::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
DebuggerScope* thisObject = jsCast<DebuggerScope*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(cell, visitor);
visitor.append(thisObject->m_scope);
visitor.append(thisObject->m_next);
}
String DebuggerScope::className(const JSObject* object, VM& vm)
{
const DebuggerScope* scope = jsCast<const DebuggerScope*>(object);
// We cannot assert that scope->isValid() because the TypeProfiler may encounter an invalidated
// DebuggerScope in its log entries. We just need to handle it appropriately as below.
if (!scope->isValid())
return String();
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
return thisObject->methodTable(vm)->className(thisObject, vm);
}
String DebuggerScope::toStringName(const JSObject* object, JSGlobalObject* globalObject)
{
const DebuggerScope* scope = jsCast<const DebuggerScope*>(object);
// We cannot assert that scope->isValid() because the TypeProfiler may encounter an invalidated
// DebuggerScope in its log entries. We just need to handle it appropriately as below.
if (!scope->isValid())
return String();
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
return thisObject->methodTable(globalObject->vm())->toStringName(thisObject, globalObject);
}
bool DebuggerScope::getOwnPropertySlot(JSObject* object, JSGlobalObject* globalObject, PropertyName propertyName, PropertySlot& slot)
{
DebuggerScope* scope = jsCast<DebuggerScope*>(object);
if (!scope->isValid())
return false;
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
slot.setThisValue(JSValue(thisObject));
// By default, JSObject::getPropertySlot() will look in the DebuggerScope's prototype
// chain and not the wrapped scope, and JSObject::getPropertySlot() cannot be overridden
// to behave differently for the DebuggerScope.
//
// Instead, we'll treat all properties in the wrapped scope and its prototype chain as
// the own properties of the DebuggerScope. This is fine because the WebInspector
// does not presently need to distinguish between what's owned at each level in the
// prototype chain. Hence, we'll invoke getPropertySlot() on the wrapped scope here
// instead of getOwnPropertySlot().
bool result = thisObject->getPropertySlot(globalObject, propertyName, slot);
if (result && slot.isValue() && slot.getValue(globalObject, propertyName) == jsTDZValue()) {
// FIXME:
// We hit a scope property that has the TDZ empty value.
// Currently, we just lie to the inspector and claim that this property is undefined.
// This is not ideal and we should fix it.
// https://bugs.webkit.org/show_bug.cgi?id=144977
slot.setValue(slot.slotBase(), static_cast<unsigned>(PropertyAttribute::DontEnum), jsUndefined());
return true;
}
return result;
}
bool DebuggerScope::put(JSCell* cell, JSGlobalObject* globalObject, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
DebuggerScope* scope = jsCast<DebuggerScope*>(cell);
ASSERT(scope->isValid());
if (!scope->isValid())
return false;
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
slot.setThisValue(JSValue(thisObject));
return thisObject->methodTable(globalObject->vm())->put(thisObject, globalObject, propertyName, value, slot);
}
bool DebuggerScope::deleteProperty(JSCell* cell, JSGlobalObject* globalObject, PropertyName propertyName, DeletePropertySlot& slot)
{
DebuggerScope* scope = jsCast<DebuggerScope*>(cell);
ASSERT(scope->isValid());
if (!scope->isValid())
return false;
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
return thisObject->methodTable(globalObject->vm())->deleteProperty(thisObject, globalObject, propertyName, slot);
}
void DebuggerScope::getOwnPropertyNames(JSObject* object, JSGlobalObject* globalObject, PropertyNameArray& propertyNames, EnumerationMode mode)
{
DebuggerScope* scope = jsCast<DebuggerScope*>(object);
ASSERT(scope->isValid());
if (!scope->isValid())
return;
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
thisObject->methodTable(globalObject->vm())->getPropertyNames(thisObject, globalObject, propertyNames, mode);
}
bool DebuggerScope::defineOwnProperty(JSObject* object, JSGlobalObject* globalObject, PropertyName propertyName, const PropertyDescriptor& descriptor, bool shouldThrow)
{
DebuggerScope* scope = jsCast<DebuggerScope*>(object);
ASSERT(scope->isValid());
if (!scope->isValid())
return false;
JSObject* thisObject = JSScope::objectAtScope(scope->jsScope());
return thisObject->methodTable(globalObject->vm())->defineOwnProperty(thisObject, globalObject, propertyName, descriptor, shouldThrow);
}
DebuggerScope* DebuggerScope::next()
{
ASSERT(isValid());
if (!m_next && m_scope->next()) {
VM& vm = m_scope->vm();
DebuggerScope* nextScope = create(vm, m_scope->next());
m_next.set(vm, this, nextScope);
}
return m_next.get();
}
void DebuggerScope::invalidateChain()
{
if (!isValid())
return;
DebuggerScope* scope = this;
while (scope) {
DebuggerScope* nextScope = scope->m_next.get();
scope->m_next.clear();
scope->m_scope.clear(); // This also marks this scope as invalid.
scope = nextScope;
}
}
bool DebuggerScope::isCatchScope() const
{
return m_scope->isCatchScope();
}
bool DebuggerScope::isFunctionNameScope() const
{
return m_scope->isFunctionNameScopeObject();
}
bool DebuggerScope::isWithScope() const
{
return m_scope->isWithScope();
}
bool DebuggerScope::isGlobalScope() const
{
return m_scope->isGlobalObject();
}
bool DebuggerScope::isGlobalLexicalEnvironment() const
{
return m_scope->isGlobalLexicalEnvironment();
}
bool DebuggerScope::isClosureScope() const
{
// In the current debugger implementation, every function or eval will create an
// lexical environment object. Hence, a lexical environment object implies a
// function or eval scope.
return m_scope->isVarScope() || m_scope->isLexicalScope();
}
bool DebuggerScope::isNestedLexicalScope() const
{
return m_scope->isNestedLexicalScope();
}
String DebuggerScope::name() const
{
SymbolTable* symbolTable = m_scope->symbolTable(vm());
if (!symbolTable)
return String();
CodeBlock* codeBlock = symbolTable->rareDataCodeBlock();
if (!codeBlock)
return String();
return String::fromUTF8(codeBlock->inferredName());
}
DebuggerLocation DebuggerScope::location() const
{
SymbolTable* symbolTable = m_scope->symbolTable(vm());
if (!symbolTable)
return DebuggerLocation();
CodeBlock* codeBlock = symbolTable->rareDataCodeBlock();
if (!codeBlock)
return DebuggerLocation();
ScriptExecutable* executable = codeBlock->ownerExecutable();
return DebuggerLocation(executable);
}
JSValue DebuggerScope::caughtValue(JSGlobalObject* globalObject) const
{
ASSERT(isCatchScope());
JSLexicalEnvironment* catchEnvironment = jsCast<JSLexicalEnvironment*>(m_scope.get());
SymbolTable* catchSymbolTable = catchEnvironment->symbolTable();
RELEASE_ASSERT(catchSymbolTable->size() == 1);
PropertyName errorName(catchSymbolTable->begin(catchSymbolTable->m_lock)->key.get());
PropertySlot slot(m_scope.get(), PropertySlot::InternalMethodType::Get);
bool success = catchEnvironment->getOwnPropertySlot(catchEnvironment, globalObject, errorName, slot);
RELEASE_ASSERT(success && slot.isValue());
return slot.getValue(globalObject, errorName);
}
} // namespace JSC